Improvement in hinged slates



R.. S. BARNUM,

HINGED SLATE.

No. 188,840. Patented March 27, 1877.

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UNITED STATES PATENT GFEICE.

RUSSEL S. BARNUM, OF CHICAGO, ILLINOIS, ASSIGNOR TO HARRY C. GOODRICH, OF SAME PLACE.

IMPROVEMENT IN HINGED SLATES.

Specification forming part of Letters Patent No. 188,840, dated March 27, 1877; application filed l December 26, 1876.

To all whom t may concern: f.

Be it known that I, RUSSEL S. BARNUM, of the city of Chicago, Cook county, State of Illinois, have invented a new and useful Improvement in Slates, of which the following is a full description, reference being had to the l accompanying drawings, in which-e,

Figure 1 is a plan view, representing the two slates open Fig. 2, an end viewjshowing the two slates closed. I

The object of this invention is to provide a double slate, the two slates being hinged together in a simple manner, and so as to permit the folding of the slates in either way; and this I accomplish by interlaci'ng, along the back of the slates, cords which form the mufing material, the joint bei-ng formed at the same time that the muftling material is applied.

In the drawings, A B represent the frames of two ordinary slates, each provided with a series of holes, a, near the outer edge, to receive cords which form the muing material. In the frame A are two cords, b c, which are passed through theholes a, andwound over the edge of the frame. In the frame B are two other cords, e d. Along the back of the double slate the two cords b c cross over from one frame to the other, and are interlaced with the two cords e d, which also, along the back of the two slates, pass over from one slate to the other, as represented in Fig. 1. -As shown,

the two cords b care carried, at the upper end of the two slates, overinto the holes in the frameB,

while the other two cords, e d, are carried over into the top of the frame A. This interlacing of these four cords along the back of the two slates forms a very etcient hinge, which permits the folding of the two slates together either Way; and the arrangement of the cords is such that in use they do not, along the back of the slate, rub against each other, so as to wear theingA away. The ends of the cords are fastened by driving pins into the holes.

In using the slates it 'is not necessary to open them in order to get the writing or figures where the saine can be protected. The slates can be closed together, and, having been used in that position, can be reversed, bringing the writing or figures upon the inside.

I do not claim a slate-frame rendered noiseless by the use of cords drawn into holes in f RUSSEL S. BARNUM. Witnesses O. W. BOND, H. F. BEUNS. 

